Steam-generating attachment for boilers



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G. W. TILTON.

STEAM GENERATING ATTACHMENT FOR BOILERS. 'NO. 387,271. Patented 'AlIgL'Y, 1888.

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G. W. VTILTONJ STEAM GENERATING ATTACHMENT FOR BOILERS. No. 387,271.

PatentedAug 7, 1888.

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GEORGE \V. TILTON, OF CHICAGO, ILLINOIS.

STEAM-GENERATENG ATTACHMENT FOR BOILERS.

EPECIPICATION forming part of Letters Patent are. 387,271, dated August 7, 1888.

Application tiled March 13, 1888. Serial No. 267,118. (X0 model.)

To all whom it may concern:

Be it known that I, GEORGE XV. TILTON, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Steam-Generating Attachments for Locomotive-Boilers, of which the following is a full, clear, and exact description, that will enable others to make and use the same, reference being bad to the accompanying drawings, forming a part of this specification.

The object of this invention is to provide an improved device for increasing the heating andsteam-generating capacity of a boiler, and is more especially intended for use in connection with locomotive-boilers.

Figure 1 is a vertical longitudinal section through the fire-box of a locomotive boiler in the plane 1, Figs. 2 and 3; Fig. 2, a hori zontal section in the plane 2, Fig. 1; and Fig. 3,a vertical transverse section in the planes 3 and 8", Fig. 1.

Referring to the drawings, A represents the boiler; A, the fire-box or combustion-cham ber; N, the crown-sheet; A, the crown-bars, and A the line of the grate-bars.

B is a horizontal watercirculating tube, which may be of any desired diameter, and is arranged transversely in the fire-box below the central line of the boiler. The ends of this tube are provided with the attachingflanges a a, which are made to bear closely against and are rigidly secured to the inner shell or wall, a, of the firebox, thus firmly securing the tube in the position shown. The tube B is open at both ends and communicates wit-h the water space or compartment of the boiler between the inner shell, a, and the outer shell, a, on, each side of the firebox. The tube B is of an oval form in cross-section, presenting a somewhat flattened surface on the upper and under side, as shown in Fig. 1. The horizontal stay-rod a passes through the longitudinal center of the tube B, and is rigidly fixed at both ends in the outside shell of the boiler. This stayrod serves to strengthen the boiler-shell opposite the open ends of the tube and prevents any tendency to bulge or collapse. The tube is strengthened by a number of vertical stay-bolts, a arranged on the interior of the same.

0 G represent two series or rows of watercirculating pipes. The lower ends of the series O are'inserted at intervals in the tube B on the front side of the stay-rod a and so e spaced as to bring a vertical stay-bolt between each pipe. The water-circulating pipes take an angular course, first extending upward in a vertical plane, then following a horizontal line toward the front, and, finally, again taking an upward direction and termipating in the crown-sheet and opening into the waterspace below the-waterline, as shown. Each alternate pipe is of a different length, so as to bring them into a corresponding alternate po-' sition between the crown-bars when inserted in the crown-sheet.

The second companion series of pipes, 0, have the same arrangement as that of the series O, with the difference that the lower ends of the pipes O are inserted in the main supplytube B just back of the stay-rod a and enter the crown-sheet at a point back of the series 0, as shown in Figs. 1 and 2. The series 0 alternate with reference to the front series, 0, 7

so as to come opposite the spacewseparating thelatter, and thereby receive the full impact of the heat and flames passing between the same.

It is obvious that the precise arrangement and grouping of the generating and circulating pipes need not be closely adhered to; butany arrangement of the same that will afi'ord the best results as to increasing the amount of heating and evaporating surface will come 8 within the spirit of my invention, and any number of pipes (more orlcss) may be used.

The circulating and steam-generating pipes are each inserted independently of the other,

so that any particular one may be conveno iently removed and replaced without disturbing the entire series. One or more transverse water-tubes may be employed-that is, one for each series or row of circulating-pipes. The

tubes may also be of a cylindrical or circular 5 pass between and around the series of steamgenerating pipes, thus obtaining the best possible results from the fuel consumed. The water entering the series of pipes being already at the boiling'point, it is evident that steam will be quickly and freely generated in the same and somewhat in excess of the boiler production. This being the effect, it necessarily follows that a continuous circulation will be maintained, as the rapid generation of steam in the pipes will create acontinuous ascending current, the steam carrying the water up with it instead of passing through it. The discharge ends of the series of pipes being constantly submerged, the weight of the water and pressure of steam above the crownsheet act as a check to prevent any unusual action, and at the same time preserve the equilibrium of the body of waterin the boiler. If the upper discharge or return ends of the series of pipes were notsubmerged,butopened into the steam space, the effect would be an irregular and spasmodic action, and heavy firing would have a tendency to force the water out of the pipes faster than the supply.

The water-supply tube B may be of any de sired diameter; but by taking the water in at both ends, as shown, one of a much less diame ter may be used than if but one end opened into the water-compartment. Taking the wa ter simultaneously from both sides of the boiler also has the effect of securing a uniform action and maintaining the proper balance between the circulation and boiler. The sediment 0r floating impurities in the water cannot find a lodgment nor collect in the series of pipes, as all mat-terpassing into the same is kept in constant motion andincrustation prevented. The series ofsteam-generating pipes also serves as a sparloarrester to a certain extent. Thesparks coming in contactwith the pipes rebound and again drop into the fire, where they are consumed, instead of being drawn out by the exhaust of the engine.

Having thus described my invention, what 1'. claim as new, and desire to secure by Letters Patent, is-

1. In a locomotive-boiler, the combination, with the fire-box, of the horizontal transverse tube B, provided with attaching-flanges and rigidly secured to the inner inclosing sides of the fire-box, and opening at both ends into the water-compartment of the boiler, a number of water-circulating and steam-generating pipes having the lower ends inserted in said water tube and extending upwardly and outwardly in an angular path therefrom, and finally terminating in the crown-sheet and communicating with the water-space above the same and below the water-line, and the solid inclined plate or wall D, closing the space between said watertube and the rear side ofthefirebox, whereby a continuous circulation is maintained, as described, and the heat forced to pass upward in front of said water-tube and between the series of pipes inserted therein, substantially as and for the purpose set forth.

2. In a locomotive or other boiler, the combination, with a water-supply tube opening at both ends into the water-space of the boiler below a central line, of the series of circulating-pipes C, inserted in said tube and following an angular course upward therefrom, and finally ending in the crown-sheet and opening on a level with the interior surface of the same, and the second series of companion pipes, 0, arranged in the same manner as the pipes G andjust back of the same, and alternating, so that each of the pipes 0 comes opposite the space separating the companion series, whereby the heat passing between the first series has a full impact on the surface of the second series, substantially as set forth.

GEORGE WV. TILTON.

Witnesses:

L. M. FREEMAN, L. B. COUPLAND. 

